RT Book, Section
A1 Jameson, J. Larry
A1 Fauci, Anthony S.
A1 Kasper, Dennis L.
A1 Hauser, Stephen L.
A1 Longo, Dan L.
A1 Loscalzo, Joseph
SR Print(0)
ID 1167062689
T1 Subarachnoid Hemorrhage
T2 Harrison's Manual of Medicine, 20e
YR 2020
FD 2020
PB McGraw-Hill Education
PP New York, NY
SN 9781260455342
LK accessmedicine.mhmedical.com/content.aspx?aid=1167062689
RD 2024/04/24
AB Excluding  head  trauma,  the  most  common  cause  of  subarachnoid  hemorrhage  (SAH)  is  rupture  of  an  intracranial  saccular  aneurysm;  other  etiologies  include  bleeding  from  a  vascular  malformation  (arteriovenous  malformation  or  dural  arteriovenous  fistula)  and  extension  into  the  subarachnoid  space  from  a  primary  intracerebral  hemorrhage.  Approximately  2%  of  the  population  harbor  aneurysms,  and  25,000–30,000  cases  of  aneurysmal  rupture  producing  SAH  occur  each  year  in  the  United  States;  rupture  risk  for  aneurysms  <10  mm  in  size  is  ∼0.1%  per  year;  for  unruptured  aneurysms,  the  surgical  morbidity  rate  far  exceeds  the  percentage.